package cn.tedu.boot02.controller;

import cn.tedu.boot02.entity.Product;
import cn.tedu.boot02.util.DBUtil;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;

@Controller
public class ProductController {
    @RequestMapping("/insert")
    @ResponseBody
    public String insert(Product product){
        try (Connection conn= DBUtil.getConnection()){
            String sql="insert into product values(null ,?,?,?)";
            PreparedStatement ps=conn.prepareStatement(sql);
            ps.setString(1,product.getTitle());
            ps.setDouble(2,product.getPrice());
            ps.setInt(3,product.getNum());
            int num =ps.executeUpdate();
            System.out.println(num);
            if(num>0){
                return "添加完成<a href='/'>放回首页</a>";
            }
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        System.out.println("product = " + product);
        return "添加失败!";
    }

    @RequestMapping("/select")
    @ResponseBody
    public String select(){
        ArrayList<Product> list=new ArrayList<>();
        try (Connection conn= DBUtil.getConnection()){
            String sql="select id,title,price,num from product";
            PreparedStatement ps=conn.prepareStatement(sql);
             ResultSet rs =ps.executeQuery();
            while(rs.next()){
                Product p=new Product(rs.getInt("id"),rs.getString("title"),rs.getDouble("price"),rs.getInt("num"));
                list.add(p);
            }
            System.out.println(list);
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        String html = "<table border='1'>";
        html+="<caption>商品列表</caption>";
        html+="<tr><th>id</th><th>商品标题</th><th>价格</th><th>库存</th><th>操作</th></tr>";
        for (Product p: list) {
            html+="<tr>";
            html+="<td>"+p.getId()+"</td>";
            html+="<td>"+p.getTitle()+"</td>";
            html+="<td>"+p.getPrice()+"</td>";
            html+="<td>"+p.getNum()+"</td>";
            html+="<td><a href='/delete?id="+p.getId()+"'>删除</a></td>";
            html+="</tr>";
        }
        html+="</table>";
        return html;
    }
    @RequestMapping("/delete")
    @ResponseBody
    public String delete(int id){
        System.out.println("id = " + id);
        try (Connection conn = DBUtil.getConnection()){
            String sql = "delete from product where id=?";
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setInt(1,id);
            ps.executeUpdate();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        return "删除完成!<a href='/select'>返回列表页面</a>";

    }


    @RequestMapping("/update")
    @ResponseBody
    public String update(Product product){
        try (Connection conn= DBUtil.getConnection()){
            String sql="update product set title=?,price=?,num=? where id=?";
            PreparedStatement ps=conn.prepareStatement(sql);
            ps.setString(1,product.getTitle());
            ps.setDouble(2,product.getPrice());
            ps.setInt(3,product.getNum());
            ps.setInt(4,product.getId());
            ps.executeUpdate();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        return "修改完成<a href='/'>返回</a>";
    }
}
